Search results

  1. colum

    400 Hertz at 120 V

    Thanks for the advice..I will check those sites So I guess a 60 cy transformer would not work well on 400cy Jeff
  2. colum

    400 Hertz at 120 V

    The only thing I know for sure is they are built like tanks and the technology predates the IC I tested 60cy and 120v units at household supply and at a square wave but all worked fine the amplitude of the voltage made a big difference in the swing of the indicators Jeff
  3. colum

    400 Hertz at 120 V

    I want to drive a Vibration meter at 400 Hertz and 120V and about 5 t0 10 Watts (a guess) I wonder if someone would suggest a circuit and if a 60 cy transformer can handle high Hertz This is going to be a onetime testing for several instruments and I would like to do it without spending too...
  4. colum

    Timer 555 voltage

    Thanks Bluejets..I want to drive a transistor with a higher voltage output independently of the 555 ct I like to experiment and it really doesn't bother me if I fail I just try again. I do appreciate help from these forums otherwise there would be far more fails and with Radio Shack gone parts...
  5. colum

    Timer 555 voltage

    Thanks for the replies..As advised I will use one battery for the 555 and an other supply for the rest of the circuit..colum
  6. colum

    Timer 555 voltage

    I want to apply two 9 volt batteries to a 555 timer supply to make 18 volts but according to instructions a 555 timer calls for 15 volts max..Other than using one battery for the timer..What is the best way to reduce the voltage to less than 15...Thanks....colum
  7. colum

    Laser

    Thanks Bluejets. very interesting idea...colum
  8. colum

    Laser

    I want to activate a sensor with a Laser but the Laser must stay on in order to activate a sequence The ones I see are pointers and are only on when the button is pressed. I would appreciate any advice....Thanks...colum
  9. colum

    Pulse Width Modulation

    Thanks Analog Kid that is the information I was looking for...colum General statement Is Hevens 1944 a Troll or what
  10. colum

    Pulse Width Modulation

    Thanks Harald you brought back my memory. The second 555 was set up as a monostable so now I must find the second 555 hook up ...I don't have an Oscilloscope so I would imagine that a Monostable would give a higher Volt at the peak as opposed to a longer pulse altho it is diagrammed as a...
  11. colum

    Pulse Width Modulation

    I built this circuit many years ago using wire wrap and is very difficult to untangle all I know is that the second 555 has a big effect on the motor and I want to build another one...I did see a wiring diagram of a double 555 in one IC (forgot number) for PWM This circuit is going to aim a...
  12. colum

    Pulse Width Modulation

    I have a small DC motor that is driven by 2 555 timer circuits and 2 Pots and a Transistors in PWM mode...I know the first 555 is the timer and the second 555 does what...does it amplify each pulse at its peak or does it make the pulse longer duration. I would greatly appreciate it if...
  13. colum

    LED light receiver

    Thanks Harold I Googled it and its exactly what I needed.....Jeff
  14. colum

    LED light receiver

    Thanks Constatine I meant to say I was using a red Laser...colum
  15. colum

    LED light receiver

    I have a robotic arm that aims a Red LED at a dart board and works very well. I need a Diode that receives this light . is there a circuit or Diode that I can use to activate a visible LED to indicate a bullseye Thank you for reading this .....Jeff Thanks Steve for teaching me how to hook up a...
  16. colum

    LED string

    Thanks Steve, I did try a Red a Green and a Blue and thanks for the resistor placement and Ohm advice colum
  17. colum

    LED string

    Thank you for responding Steve...One resistor at input + 330 ohms....colum
  18. colum

    LED string

    I have a mechanical arm that has 4 limit switches that is hooked up to 4 LEDs. 3 of the LEDs light up fine when activated but the last LED of the chain seems to take all of the power of the 9v battery when activated I have switched LEDs etc but always the last Led prevents the first 3 from lighting
  19. colum

    Green laser

    Why Green? I heard that Green is more visible and smaller dot size at longer distance and its now less dangerous with a IR filter and I agree that a DC motor driven chain pointer seems inaccurate but that will be part of the challenge so I will adjust the target size and rely on a time element...
  20. colum

    Green laser

    Thank you for reading this I want to get a Green Laser with an IR filter also if possible to get a focusable unit all built in I am reactivating a Lab heavy duty chain driven pointing device and have all the motors wired up and intend to use it as a type of light emitting device to a dartboard...
Top